Answer all the questions below then hit the check answer button and scroll down to get your score.
1. Who first isolated benzene from the oily residue of a London street lamp?
2. What is the molecular formula of benzene?
3. The failure of benzene to undergo typical alkene addition reactions provides evidence that:
4. According to Kekulé’s model benzene contains double and single carbon carbon bonds.
5. What type of reaction would you usually expect an unsaturated molecule to undergo?
6. Despite its unsaturated molecular formula benzene and other aromatic molecules undergo electrophilic reactions in the presence of a acid catalyst.
7. How many isomers of monobromobenzene exist?
8. According to Kekulé the explanation for the existence of only one 1,2-dibrombenzene isomer is due to the fact that the two possible isomers rapidly.
9. The enthalpy of hydrogenation of cyclohexane is approximately?
10. If Kekulé's cyclohexa-1,3,5-triene structure for benzene was correct what would be the expected enthalpy of hydrogenation of benzene?
11. What is the actual enthalpy of hydrogenation of benzene?
12. The enthalpy of hydrogenation of benzene is much less than the expected value for the structure of benzene as suggested by Kekulé, this indicates that benzene is much more than predicted by Kekulé. In fact benzene is approximately kJmol-1 more stable than predicted.
13. What concept developed by Linus Pauling and other in the early 1930's helped explain the properties and structure of benzene?
14. In benzene the six delocalised pi electrons are located in molecular orbitals formed by the sideways overlap of:
15. In the modern resonance model of benzene the pi electrons are across all the carbon atoms in the hexagonal ring structure.
